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Wereldsma, R. (author) journal article 1980
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Wereldsma, R. (author) journal article 1976
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Wereldsma, R. (author) journal article 1974
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Wereldsma, R. (author) journal article 1970
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Wereldsma, R. (author) journal article 1968
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Wereldsma, R. (author) journal article 1967
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Wereldsma, R. (author) journal article 1966
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Wereldsma, R. (author) journal article 1965
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Wereldsma, R. (author) journal article 1965
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Wereldsma, R. (author) journal article 1964
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Wereldsma, R. (author) journal article 1964
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Wereldsma, R. (author) journal article 1962
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Wereldsma, R. (author) journal article 1962
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Wereldsma, R. (author) journal article 1959